2 x 6990's - Faulty Core????

[doodie]

Hi Guys,

Some help please...

Running 2 x 6990's in crossfire mode on Win 7 64.

3 cores are running @ about 350mh/s each but have one core that runs @ 125mh/s only.

I have noticed that when running Diablo miner I get 8 CU on the core instead of 24 CU on the other 3.

MSI Afterburner reports the core at 99% capacity but only reaches 55C temp... this surely is not running properly.

I think that it maybe a faulty core but just checking with you guys that you have not come across this before.

Any ideas?

Best

D

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[Ryu.Hayabusa]

Definitely possible.  Try playing some intensive 3d game or running a 3d benchmark such as Unigine Heaven to see if any artifacts appear or the GPU crashes the game/program.

[Neokolzia]

Run MSI Kombustor its good at picking out artifacts, also Miners aren't fond of Crossfire set up's.

I know mine makes CPU usage, tho I don't need a dummy plug.

[bmgjet]

Also possible its not getting enough power so underclocking its self.

[Neokolzia]

Post your entire rig setup, that is pretty power hungry so its possible.

[organofcorti]

Also try without crossfire.

[Ryu.Hayabusa]

MSI Kombuster would mainly be good for checking heat as it uses OpenGL, which generally will not show artifacts or crashes.

[doodie]

Also possible its not getting enough power so underclocking its self.

Currently running 830/1250 so normal clock position on the cards.

Fractal Design Define R3   
AMD Phenom II X4 840 (4 x 3.2 GHz) AM3 2MB   
AMD Heatsink & Fan   
Corsair 2GB XMS3 PC3-10666 1333MHz (2x1GB)
2 x ATI Radeon HD 6990 - (XFX) CrossFireX Setup   
Asus Crosshair IV Extreme (AMD 890FX)   
Motherboard Integrated HD Sound   
Integrated Ethernet Lan (Broadband Ready)   
Cooler Master 1000W Silent Pro   
500 GB SATA-II HDD 7200 8MB   
Samsung (SH-D162D) 16x DVD-ROM - Black (SATA)   
Microsoft Windows 7 Professional 64 BIT

GPU-Z shots - Check out the shaders and texture fill rate???

Good Core:
http://img585.imageshack.us/img585/2937/ok6990core.gif

Problem Core:
http://img600.imageshack.us/img600/1500/problem6990core.gif

Check out 8 CU on first core when starting Diablominer..

http://img607.imageshack.us/img607/8104/8cu.jpg

Have tried with and without Crossfire enabled with a dummy plug.... no joy.

Thanks

D

[PLaci1982]

95% chance, that the card are faulty...

Try to put only the faulty card in, and see what the miner/GPU-Z telling you